import { useState } from 'react';
import { useNavigate, Link } from 'react-router-dom';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Card } from '@/components/ui/card';
import { login } from '@/lib/auth';
import { useAuth } from '@/contexts/AuthContext';
import { Eye, EyeOff, Loader2 } from 'lucide-react';

/**
 * 登录页面
 * 左侧表单 + 右侧图片布局
 */
export default function Login() {
  const navigate = useNavigate();
  const { refreshUser } = useAuth();
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [showPassword, setShowPassword] = useState(false);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');
    setLoading(true);

    try {
      console.log('Logging in...');
      const result = await login(email, password);
      console.log('Login result:', { success: result.success, hasToken: !!result.access_token });

      if (result.success && result.access_token) {
        // 登录成功，刷新用户信息（会从 localStorage 读取）
        console.log('Refreshing user...');
        await refreshUser();
        
        console.log('Navigating to home...');
        // 跳转到首页
        navigate('/');
      } else {
        setError(result.error || '登录失败，请检查邮箱和密码');
      }
    } catch (err) {
      console.error('Login error:', err);
      setError(err instanceof Error ? err.message : '登录失败，请稍后重试');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="flex min-h-screen">
      {/* 左侧表单 */}
      <div className="flex w-full items-center justify-center bg-background p-8 lg:w-1/2">
        <div className="w-full max-w-md space-y-8">
          {/* 标题 */}
          <div className="text-center">
            <h1 className="text-3xl font-bold">Welcome back</h1>
            <p className="mt-2 text-muted-foreground">
              Login to your Feng Admin account
            </p>
          </div>

          {/* 登录表单 */}
          <form onSubmit={handleSubmit} className="space-y-6">
            {/* 错误提示 */}
            {error && (
              <div className="rounded-lg bg-destructive/10 p-3 text-sm text-destructive">
                {error}
              </div>
            )}

            {/* 邮箱 */}
            <div className="space-y-2">
              <label
                htmlFor="email"
                className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70"
              >
                Email
              </label>
              <Input
                id="email"
                type="email"
                placeholder="m@example.com"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                required
                disabled={loading}
              />
            </div>

            {/* 密码 */}
            <div className="space-y-2">
              <div className="flex items-center justify-between">
                <label
                  htmlFor="password"
                  className="text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70"
                >
                  Password
                </label>
                <Link
                  to="/forgot-password"
                  className="text-sm text-primary hover:underline"
                >
                  Forgot your password?
                </Link>
              </div>
              <div className="relative">
                <Input
                  id="password"
                  type={showPassword ? 'text' : 'password'}
                  placeholder="••••••••"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  required
                  disabled={loading}
                />
                <button
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className="absolute right-3 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
                >
                  {showPassword ? (
                    <EyeOff className="h-4 w-4" />
                  ) : (
                    <Eye className="h-4 w-4" />
                  )}
                </button>
              </div>
            </div>

            {/* 登录按钮 */}
            <Button type="submit" className="w-full" disabled={loading}>
              {loading ? (
                <>
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                  Logging in...
                </>
              ) : (
                'Login'
              )}
            </Button>

            {/* 分隔线 */}
            <div className="relative">
              <div className="absolute inset-0 flex items-center">
                <span className="w-full border-t" />
              </div>
              <div className="relative flex justify-center text-xs uppercase">
                <span className="bg-background px-2 text-muted-foreground">
                  Or continue with
                </span>
              </div>
            </div>

            {/* 第三方登录 */}
            <div className="grid grid-cols-3 gap-3">
              <Button variant="outline" type="button" disabled>
                <svg className="h-5 w-5" viewBox="0 0 24 24">
                  <path
                    d="M12.152 6.896c-.948 0-2.415-1.078-3.96-1.04-2.04.027-3.91 1.183-4.961 3.014-2.117 3.675-.546 9.103 1.519 12.09 1.013 1.454 2.208 3.09 3.792 3.039 1.52-.065 2.09-.987 3.935-.987 1.831 0 2.35.987 3.96.948 1.637-.026 2.676-1.48 3.676-2.948 1.156-1.688 1.636-3.325 1.662-3.415-.039-.013-3.182-1.221-3.22-4.857-.026-3.04 2.48-4.494 2.597-4.559-1.429-2.09-3.623-2.324-4.39-2.376-2-.156-3.675 1.09-4.61 1.09zM15.53 3.83c.843-1.012 1.4-2.427 1.245-3.83-1.207.052-2.662.805-3.532 1.818-.78.896-1.454 2.338-1.273 3.714 1.338.104 2.715-.688 3.559-1.701"
                    fill="currentColor"
                  />
                </svg>
              </Button>
              <Button variant="outline" type="button" disabled>
                <svg className="h-5 w-5" viewBox="0 0 24 24">
                  <path
                    d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"
                    fill="#4285F4"
                  />
                  <path
                    d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"
                    fill="#34A853"
                  />
                  <path
                    d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"
                    fill="#FBBC05"
                  />
                  <path
                    d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"
                    fill="#EA4335"
                  />
                </svg>
              </Button>
              <Button variant="outline" type="button" disabled>
                <svg className="h-5 w-5" viewBox="0 0 24 24" fill="currentColor">
                  <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" />
                </svg>
              </Button>
            </div>

            {/* 注册链接 */}
            <div className="text-center text-sm">
              Don't have an account?{' '}
              <Link to="/register" className="font-medium text-primary hover:underline">
                Sign up
              </Link>
            </div>
          </form>

          {/* 服务条款 */}
          <p className="text-center text-xs text-muted-foreground">
            By clicking continue, you agree to our{' '}
            <Link to="/terms" className="underline underline-offset-4 hover:text-primary">
              Terms of Service
            </Link>{' '}
            and{' '}
            <Link to="/privacy" className="underline underline-offset-4 hover:text-primary">
              Privacy Policy
            </Link>
            .
          </p>
        </div>
      </div>

      {/* 右侧图片 */}
      <div className="hidden lg:block lg:w-1/2">
        <div className="relative h-full w-full bg-gradient-to-br from-primary/20 via-primary/10 to-background">
          {/* 装饰性背景 */}
          <div className="absolute inset-0 bg-grid-white/10 bg-[size:20px_20px]" />
          
          {/* 中心内容 */}
          <div className="relative flex h-full flex-col items-center justify-center p-12 text-center">
            <div className="space-y-4">
              <h2 className="text-4xl font-bold">Feng Admin</h2>
              <p className="text-xl text-muted-foreground">
                Your personal productivity powerhouse
              </p>
              <div className="mx-auto mt-8 grid max-w-md gap-4">
                <Card className="bg-background/50 p-4 backdrop-blur">
                  <p className="text-sm">✨ AI-Powered Agents</p>
                </Card>
                <Card className="bg-background/50 p-4 backdrop-blur">
                  <p className="text-sm">📝 Smart Note Taking</p>
                </Card>
                <Card className="bg-background/50 p-4 backdrop-blur">
                  <p className="text-sm">✅ Task Management</p>
                </Card>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

